When a tenant moves in or out partway through a month, rent is commonly prorated to charge only for the days actually occupied.
How it works
Monthly rent divided by days in the month, times days occupied, gives the prorated rent.
What this does not include
This uses a simple daily-rate proration method — some leases specify a different proration formula (like always dividing by 30 days regardless of the actual month length), which would produce a slightly different result than this calendar-accurate method.
How to use this calculator
- Enter monthly rent, days in the month, and days occupied.
Frequently asked questions
Why does the daily rate change month to month?
Because months have different numbers of days (28-31) — dividing the same monthly rent by a different day count changes the effective daily rate slightly each month.
Is proration always used for partial months?
Not necessarily — some leases charge a full month’s rent regardless of move-in/move-out date; proration is common but not universal, and lease terms should be checked.
Does proration apply the same way to move-in and move-out?
The same math applies to either — days actually occupied at the start or end of a lease term are prorated using the identical daily-rate calculation.
